The 2 things that are causing the failure is that for the server that is being backed up on line 9 "ACE-AD01_2017_01_18_16_08_22_279D.TIB", it is attempting to delete file "ACE-IMG01_2017_01_11_17_02_45_515D5.TIB" in section titled "Error code: 507".

No matter how many times I directly connect to each acronis agent and view the personal vaults and click the green refresh button I always end up with multiple random failure emails the next day.